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Christopher L. Wolfe; James R. Corbett; Samuel E. Lewis; I.Maximilian Buja; James T. Willerson. (1984). Determination of left ventricular mass by single-photon emission computed tomography with thallium-201. , 53(9), 0–1368. doi:10.1016/0002-9149(84)90095-x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research